Haku Tamami, Hosoya Takaaki, Ito Hitoshi, Eguchi Yoichi, Watanabe Yasuaki, Nishina Moriyuki
Department of Radiology, Yamagata University School of Medicine, 2-2-2 Iida-nishi, Yamagata 990-9585, Japan.
J Vasc Interv Radiol. 2002 Aug;13(8):815-22. doi: 10.1016/s1051-0443(07)61991-5.
To design a radiation protection system for interventional procedures of the upper extremity and to evaluate the effectiveness of the system.
The radiation protection system consisted of an image intensifier (I-I) hood and x-ray tube cover. The I-I hood encircled the I-I to protect against scattered radiation from the patient's upper extremity and the table. The I-I hood consisted of four components: a device for attaching the hoods, two acrylate hoods with an 0.50-mm Pb equivalent, and a lead curtain hood with a 0.35-mm Pb equivalent. The x-ray tube cover was constructed of lead curtain to protect against backscattering radiation from the catheter table. An extremity phantom was used to measure the scattered radiation around the angiographic apparatus. The scattering dose rates were measured with an ionization dosimeter with and without a radiation protection system. The heights of the measuring points from the floor were 50 cm (operator's lower limbs), 100 cm (operator's abdomen), and 150 cm (operator's head/neck).
The dose rates were reduced most with the combination of the I-I hood and the x-ray tube cover. The x-ray tube cover was effective in reducing scattering when it was set close to the table and the phantom. The maximum percentage decreases in dose rates by the radiation protection system were 99% at 50 cm, 73% at 100 cm, and 100% at 150 cm. Therefore, at 50 cm and 150 cm, the high-dose-rate area around the angiographic apparatus was reduced almost completely by the radiation protection system.
The radiation protection system for interventional procedures of the upper extremity was effective in reducing scattered radiation around the angiographic apparatus.
